So... all hope is not entirely lost [MENTION=124732]LawnDart[/MENTION] and [MENTION=73851]007Tacoma[/MENTION]. I have been pouring over the diagrams and messing with this darn display on the bench when I have time. I am also in the process of doing a crawl conversion on my SR5 (which is almost complete, just waiting on the MPX) I managed to get the Cluster, display, and overhead console out of a 2014, and have wired everything up on the bench. Here's a run down of the system and how it works to end up displaying Range, Temp, etc.
The ECM and Air Conditioner amplifier assembly send Range, Temp, and Avg. MPG via the CAN BUS to the Instrument Cluster. This is the same regardless of trim level.
The Cluster, Display and Drive Monitor Switch function on a LIN BUS that is offloaded from the CAN BUS. The Drive monitor switch itself ties into the main body MPX via CANN and CANP. These two CAN lines tell the 4Runner to go into CRAWL or MTS. The LIN BUS is used to display the text in the cluster and data on the center display (Toyota really wired this one weirdly. It should have all been CAN BUS for simplicity).
So to break down the LIN BUS, here is how it works:
The Drive monitor Switch is the master node that synchronizes the Cluster and center display (Both are the slave nodes), and is the go between for both. Data from the cluster is sent via the LIN BUS to the Drive monitor Switch. This Data is then sent via single wire on the LIN BUS to the Center Display.
So to update the status of this project, I can get everything to work on the bench when powered up. If this conversion is to be done, the drive monitor switch is necessary, as it is the master node. One might not have to do a full TRAIL/TRD conversion, and instead just bury this inside the center console on the SR5/Limited. The instrument cluster is another story all together. I have opened up my SR5 cluster and the TRAIL cluster to see any differences, and apart from missing the two indicator lights for CRAWL/MTS, it would seem two SMD capacitors and 8-pin chip are not soldered to the board. I have both components on order. I am going to attempt to solder these components to the SR5 cluster to make it LIN enabled, but placing the hardware on the board is no guarantee. Toyota or Yazaki may or may not have flashed all the clusters with the same software. I will know within the next two weeks...
Anyways, wanted to keep you all up to date and say that this is still being worked on! :thumb:
Oh, and a few teaser pic's cause ya know...